<template>
  <div>
    <ul>
      <li v-for="(item, index) in arr" :key="index">
        <input type="checkbox" v-model="select" :value="item" />{{ item }}
      </li>
    </ul>
    <p>你选中的元素累加和为:{{ allSum }}</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      select: [],
      arr: [9, 15, 19, 25, 29, 31, 48, 57, 62, 79, 87],
    };
  },
  computed: {
    allSum() {
      return this.select.reduce((sum,obj)=>sum+=obj,0)
    },
  },
};
</script>

<style>
</style>